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This school teaches production AI the way it actually behaves: the failures, the fixes, and the working code. Every lesson follows the same contract: one concept in plain words, one project you can run yourself, and an honest section on what the simple version does not solve. Pick the path that matches your problem.

If you are shipping a RAG system

Begin with the failure nobody monitors: your index quietly going stale. Then the second pass that fixes ranking.

RAG SystemsYour RAG Did Not Notice the Document ChangedYour documents changed last week. Your index did not. A 260-line demo that catches a stale index lying, then fixes it with version stamps, hash-based refresh, deletion propagation, and 20 canary questions.2026-10-23 · 9 min read RAG SystemsReranking: The Second Pass That Finds RelevanceYour retriever pulled 50 chunks and the right answer ranked 37th. Retrieval finds candidates; reranking finds relevance. Two-stage retrieval, explained with the scores on the table.2026-10-23 · 6 min read

If you are building agents

Every agent is a loop. Learn to bound it before you learn to scale it: budgets, retries, and a circuit breaker.

Agent EngineeringThe Agent Tool Loop, Taken ApartEvery agent is a loop: think, call a tool, read the result, repeat. The loop is simple. Keeping it from spinning forever is the engineering. Budgets, retries, and a circuit breaker, in a runnable demo.2026-10-23 · 7 min read Watch the scenariosAgentic AI Interview ScenariosTwo-minute scenarios, every Thursday and Sunday: the setup, the trap answer, the model answer, and the follow-up twist.On YouTube →

If you are preparing for interviews

The free flagship is the fastest route in: 100 top interview questions with model answers across agents, RAG, system design, evals, data engineering, and scenarios.

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The two-minute version of the school

A concept Short every morning at 7 AM Central. The Layer by Layer newsletter every Tuesday and Friday, each edition with a project you can run. Long-form editions here and on Medium. Everything public, everything verifiable, nothing behind a paywall while the school is young.

Welcome to the school. Start anywhere, run everything.